Air heating furnace



June 16, w42.

C. DEMUTH AIR HEATING FURNACE Filed Jan. 31, 1940 2 Sheets-Sheet lV/ll//lll/llll/ vll/l l` l l l [ll/l l lllll/lllllllIllllI/I s. v l

*INVENTORL Civ/M255 Y Daw/7H.

ATTORNEK June 16, 1942. c. DEMUTH 2,28%719 AIR HEATING FURNAGE FiledJan. 31, 1940 2 Sheets-Sheet 2 l/ /l/l/ /IA l l/l /l INVENToR. GammesDewar/1.

Patented June 16, 1942 a ortica 2 Claims.

My invention relates to improvements in heating units especiallydesigned for heating the air by direct contact with the walls of thepassages for the burnt gases.

The principal object of my invention is to provide a means whereby theame when thrown into a re chamber will tend to retard the speed oftravel of the hot gases and to retain them within the body for acomparatively long period of time before they are discharged into theflue, and in this manner the walls of the re chamber are maintained at ahigh temperature with vthe consumption of a small amount of fuel. IthasV been found that heating units constructed as herein described maybe successfully and eiliciently operated with materially less fuel thanother types of heating units at present available.

Another object of my invention is to provide in a heating unit a meanswhereby the length of travel of the heat from the re chamber proper tothe ue is increased and thereby providing a maximum amount of heatingsurface.

A further object is to provide a furnace or the like that is extremelycompact and economical to construct.

In order to more clearly disclose the invention, reference is made tothe accompanying drawings, in which:

Figure 1 is a front elevation of the heating unit v with parts of theouter jacket broken away and shown in section.

Figure 2 is a longitudinal view on the line 2-2 of Figure 1.

Figure 3 is a front elevation of the heating unit with the flue memberin section.

Figure i is a perspective view taken on the line 4-4 of Figure 5,illustrating the distributing or baliie element.

Figure 5 is a longitudinal view taken on the line 5-5 of Figure 3.

Similar reference numerals refer to similar parts throughout thedrawings.

In the drawings, I is a longitudinal cylindrical fire chambermounted'upon supports 2 and 3 and housed within an external jacket Il.This jacket is preferably lined with some type of insulating material4A, such as asbestos sheet. The fire chamber I has an opening 5 in oneend and near the bottom, which is adapted to fit onto the end of an oilburner 6. An opening 'I is provided above the opening 5 for inspectionpurposes to observe the flame of the oil burner.

The compartment I is preferably lined with re brick or other refractoryIa, and which becomes incandescent as a result of the flame from the oilburner.

It will be noted with particular reference to Figure 2, that the use ofa cylindrical flre chamber, in which the oil burner flame enters throughthe round end, is important, because it permits the flame from the oilburner to have a whirling action, as indicated by the arrows. In the oldtype of oil burners, the flame is thrown into the re chamber through thecylindrical wall, the whirling action is lost, and a large amount ofheat passes directly to the open ue, and in fact some of the oil isnever burned at all.

Joined at the top of the cylindrical compartment I and spaced from thecenter thereof is a rectangular iiue 9. It has been found that byspacing the flue from the center of the fire box I that the flame as itis injected into the re box will rise to the top thereof and becomeretarded and not ow directly to the flue. The flame emitted from thenozzle of the burner generally has a helical action, and the cylindricalcompartment I is especially adapted to permit a continuation of thiswhirling action.V

Likewise, the arrangement of the flue 9 tangential to the compartment Ipermits the burned gases to continue this whirling action when passingout of the compartment I. This whirling action through the cylindricalchamber stirs up all of the oil particles and causes them to burn outentirely within the compartment I. The cylindrical chamber with the oilburner entering the end is especially adapted to this action, in thatthere are no pockets in Vwhich any of the oil or gas can be caught andleft unconsumed. By this means, a greater degree of eiciency inconsumption of oil has resulted.

The rectangular flue 9 extends upwardly vertically, and thence turns toconnect into the horizontal member I0 and thence into another verticalmember II. This arrangement of members 9, I0, and II leaves an openingI2 for a purpose to be described.

Referring to Figures 3, 4, and 5, it will be noted that inside ofmembers I0 and II there is an L shaped bafe plate I3 disposed diagonallywithin said members, as shown clearly in Figure 4. This baffle member I3acts as adeflector for detouring the gases rising out of the compartmentI, and flowing through the ues 9 and I9 and thence in a downward path toreach the lower part of the member II, as at I3a, whereupon it risesagain on the other side of the baille to reach the pipe flue I4 andchimney I5.

It will be noted in the foregoing construction that I have lengthenedthe heating surface by means of defiecting the gas downward through themember II thereby causing the gas to give up practically all of the heatunits which are to be transferred to the rooms to be heated.

It will be noted in Figure 1 that I have provided a compartment IB whichhouses a fan I'I which draws fresh air through the duct I8 and passes itover the surfaces I, 9, Ill, and II, and a considerable amount of theair will flow through the opening I2, and thence to the outlet I9. Itwill be noted that a maximum amount of heating surface has been exposedto the air passed thereover from the compartment I6, in which the blowerfan is located. It Will also be noted in Figure 1 that I have spaced theunit I from the sidewalls and ends, to provide free passage for the airflowing therethrough.

On the upper portion of the member II there is provided a coveredopening 20 for the purpose of cleaning the flues as desired.

Having described my invention, what I claim is new and desire to secureby Letters Patent is:

1. In a hot air heating furnace, a horizontal cylindrical fire chamberwith an oil burner located at the bottom of the front thereof, a heatingchamber connecting tangentially thereto in a Vertical and upwarddirection and thence extending in a horizontal and thence in a downwardand Vertical direction, and a flue connecting to the rear wall of thesaid heating chamber, an insulating jacket surrounding the fire chamberand the heating chamber and spaced away therefrom to form a hot airchamber, a blower system attached to the side wall of the said insulatedjacket adapted to flow air over the heated surfaces of the saidchambers, and an opening in the top of the said insulated jacket forconveying the heated air into a compartment to be heated.

2. In a hot air heating furnace, a horizontal cylindrical re chamberwith an oil burner located at the bottom of the front thereof, a heatingchamber connecting tangentially thereto in a vertical and upwarddirection and thence extending in a horizontal and thence in a downwardand vertical direction, baffle means to extend the path of the heatedfire gases mounted in the said heating chamber, and a flue connecting tothe rear wall of the said heating chamber, an insulated jacketsurrounding the fire chamber and the heating chamber and spaced awaytherefrom to form a hot air compartment, a blower system attached to theside wall of the said insulated jacket adapted to iiow air over theheated surfaces of the said chambers, and an opening in the top of thesaid insulated jacket for conveying the heated air into a compartment tobe heated.

CHARLES DEMUTH.

